This study includes the basic concepts and knowledge of law and is intended to be presented at a depth that is considered necessary only by healthcare professionals. The issues discussed within the scope of the doctrine of law have not been mentioned, since the references to the law books and the doctrinal debates should be avoided and limited to the extent necessary. However, it is envisaged that it can shed light on the question of which topics should be sought. Reference books are also listed at the end of the chapter. It is tried to be presented in the simplest way with the basic information which is thought to be needed in the daily practice of our colleagues. Also, these are discussed with the meanings of words used and understood in today`s life, as far as possible from the doctrinal terms and definitions, taking into consideration that the law changes over time.